摘要
利用水热合成技术,成功制备具有孔道的纯ZnO微米花和Al_2O_3掺杂的ZnO(Al_2O_3-ZnO)微米花。通过X射线衍射(XRD)、扫描电镜(SEM)、电子能谱(EDS)对样品的形貌和结构进行表征。利用所得的纯ZnO和Al_2O_3-ZnO样品制备气敏元件,并对其气敏特性进行研究。结果表明:在工作温度为260℃时,基于Al_2O_3-ZnO的气敏元件对100×10^(-6)的丙酮气体的灵敏度约为82.8,约为同条件下基于纯ZnO的气敏元件对丙酮气体灵敏度(18.0)的4.6倍,其响应时间和恢复时间分别为3s和8s,是同条件下干扰气体中灵敏度最高的乙醇气体的灵敏度(26.2)的3.16倍,该元件具有优异的选择性,能成功区分具有相似性质的丙酮和乙醇。此外,Al_2O_3-ZnO器件可检测到0.25×10-6的丙酮气体,其灵敏度约为3.1。
Pore spaced pure ZnO and Al_2O_3-doped ZnO（Al_2O_3-ZnO）micro-flowers were successfully synthesized by hydrothermal method.The microstructure,morphology and components were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）and energy-dispersive X-ray spectrometry（EDS）,respectively.Gas sensors were made to investigate the gas sensing properties.The results reveal that the sensor based on Al_2O_3-ZnO shows a high sensitivity to acetone.The sensitivity is 82.8to 100×10-6acetone gas at 260℃,which is about 4.6times larger than that of pure ZnO（18.0）at similar conditions.The response time and recovery time are about 3sand 8s,respectively.Al_2O_3-ZnO also shows an excellent selectivity.Its sensitivity to acetone is 3.16 times higher than that to ethanol,which has the highest sensitivity among interfering gases under the same conditions.Thus,Al_2O_3-ZnO sensors can successfully distinguish acetone and ethanol with similar properties.In addition,the lowest detection to acetone is about 0.25×10-6 with theresponse is about 3.1.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2017年第2期12-16,共5页
Journal of Materials Engineering
基金
吉林省科技厅重点科技攻关项目资助(20140204027GX)
青年科技创新基金资助项目(450060497053)
